Chemistry Reference
In-Depth Information
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r
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Figure 8.5
(a) CD (top) and UV (bottom) spectra of TPPS adsorbed M-SiNTs
(black) and P-SiNTs (red). (b) CD (top) and UV (bottom) spectra of
4-carboxyazobenzene-modified SiNTs: as-prepared Azo-PSiNTs.
Reproduced with permission from ref. 48, The Royal Society of Chemistry.
3
.
Chart 8.10
organisation of the inorganic phase. However, in another approach, the
precursor of the inorganic was incorporated within the gelator-like structures
to obtain templated inorganic nanomaterials. For example, compounds 24 and
25 comprised triethoxysilyl moiety as an integral part of the gelator structure
(Chart 8.11).
50
The compound 24 (either as the R,R or S,S enantiomer) gelated
a number of organic solvents such as cyclohexane or mesitylene through
H-bonds.
However, transcription experiments were carried out under acidic hydrolysis
in a purely aqueous medium. In acidic water, the synthesised inorganic/organic
hybrid materials displayed opposite macroscopic chirality depending on the
enantiomer of 24 employed. The tubular shape is likely to result from a com-
bination of two phenomena: the autoassociation abilities and a self-templating
structuration of the hybrid materials by the organic crystalline precursor. In
ethanol/water mixtures, tubular silica containing many parallel channels was
